And ebenezer



(No Model.) 6 Sheets-Sheet 1.

T. MGBRIDE & E. FISHER.

DEVIOB FOR EXGAVATING GOAL, 850.

No. 412,524. Patented Oct. 8, 1889.

6 SheetsSheet 3.

Patented Oct; 8 1889.

INVENTORIS Ifi g??? E r1:

T. MCBRIDE E. FISHER.

DEVICE FOR EXGAVATING GOAL, 850.

W ya

6 Sheets Sheet 4.

I. MeBRIDE 81; E. FISHER. DEVICE FOR BXGAVATING GOAL, e0.

Patented Oct. 8, 1889.

WITN ESSES: day/G 60 N. Pmns, mmmo n m. warm-mm 0. r;

UN TED STATES P TENT OFFICE.

TIIoMAs MCBRIDE, OF PHILADELPHIA, PENNSYLVANIA, AND EBENEZER FISHER, OFKINoA DINE, ONTARIO, oANADA.

DEVICE FOR EXCAVATING. COAL, 80C.

SPECIFICATION forming part of Letters Patent No. 412,524, dated October8, 1889. Application fileclNovember 22, 1838. $erial No. 291,531. (Nomodel.)

To all 'whom it may concern:

Be it known that we, THOMAS MCBRIDE, a citizen of the United States,residing at Philadelphia, Pennsylvania, and EBENEZER FISHER, a subjectof the Queen of Great-Britain, residing at Kincardine, in the Provinceof Ontario and Dominion of Canada, have invented new and usefulImprovements in Devices for Excavating Coal, Grain, and other Materials;and we do hereby declare the following to be a full, clear, and exactdescrip tion of said invention, reference being had to the accompanyingdrawings, and to the letters or figures of reference marked thereon,which form a part of this specification.

Our invention relates to an improved device for excavating andtransferring mate: rials-such as coal, grain, earth, (inc-from one pointto another.

The object of 'our invention is to dispense with the heavy weight ofiron or other material now used in this class of devices for forcing theexcavating buckets or scoops into the material to be raised, and also toinsure a quick and positive closing of the scoops, so as to prevent anyof the material from falling out between the scoops; and to this end ourinventionconsists in connecting the armsof the scoops to'thewinding oroperating drum by means of links or bars, whereby the power exerted toclose the scoops and hold the same in a closed position is exerted onthe outer ends of the arms of the scoops.

Other novel features of our invention will be more fully described indetail hereinafter, and pointed out in the claims.

Figure 1 is a side elevation of our improved excavator, showing the sameinan open position in full lines and in a closed position in dottedlines. Fig. 2 is a vertical sectional View on the line a: m of Fig. 4:.Fig. 3 is alongitudinal sectional view taken on the line y y of Fig. 4.-Fig. 4. is a top or plan view taken on the line 2 z of Fig. '3, and withthe crosshead which supports the rods removed. Fig. 5 is aside view ofa' modification, in which the winding and hoisting drum is parallel withthe buckets or scoops. Fig. 6 is a top or plan view of the modified formshown in Fig.

the ends of the scoops.

5 Fig. 7 is a View in perspective of one of our improved scoops.

A and A indicate the scoops forming the bucket, said scoops being of theusual clamshell shape and made of good substantial plate or sheet metal.The upper corners of the scoops are connected by means of the cross-barsB, said bars being bent down at their ends to make an obtuse angle, asshown at a, Fig. 7, for a purpose which will more fully hereinafterappear. The cross-bars B have a flange or strengthening-rib b formed ontheir under side, so as to give rigidity and strength to the structure.

. B are levers or arms, cast or forged with or otherwise secured to thecross-bars, and a short distance from the ends of the same, so that theywill set back a short distance from The levers or arms B of the scoops Aand A are'crossed and pivoted together after the fashion of a pair ofshears by the bolts C, the outer or free ends of said levers beingconnected to the bars 0 by the toggle-levers D. The bars 0' are joinedtogether by suitable stays or brace-rods D, so as to form a frame inwhich the windingdrum E is mounted.

E are braces or stay-rods, one end of which is secured to the rear upperedges of the scoops, while the other ends of said rods are secured tothe ends of the links or levers B and toggle-levers D. The office orfunction of the rods E is to brace the machine so as to form a rigidstructure. I

E is a windingdrum, the ends of which are mounted in suitable bearingsin the bars 0, said drum being provided at its center with a groovedwheel F, around which the hoistingchain F is wound.- The drum E isprovided with spiral grooves on each side of the grooved wheel F toreceive the chains G. One end of each of the chains G is secured to thedrum E, the other ends being secured to the upper frame G, as shown inFig. 5; or the chains may be passed through the pulleys H and broughtdown and secured to the bars C, as shown in Figs. 1, 2, and 4.

As before indicated, G is an upper frame of rectangular or otherform,said frame being connected to the scoops by the rods H. The rods H areconnected to the outer upper corners of the scoops A and A withhinge-joints 0, so that the scoops can be thrown out at an angle withoutdisturbing the angle of the rods H. The upper frame G is provided withan eye I, orother suitable device, to which the chain 1 is attached,said chain being connected to a derrick or to a Windlass, so that whentheloaded scoop has been brought to the (lumping-ground the weight ofthe same may be thrown on the rope I and the scoops opened to empty thesame.

In the construction just described the winding-drum is at right anglesto length of the scoops, as shown in Figs. 1, 2, 3, and 4.

In the modification shown in Figs. 5 and 6 the winding-drum is parallelwith the length of the scoopsA and A. In this construction the drum ismounted in the bars K, the ends of said bars being connected to theouter ends of the levers B by links D. The ends of the bars K areadapted to rest on the cross-bars B of the scoops when the same are inan open position, so that the weight of the windingdrum and its chainsis utilized to force the scoops downinto thematerial to be raised.

In Fig. 5 the bars K are shown secured at K, so as to allow the drum tosettle down well between the scoops, and in Fig. 4 the cross-bar isformed with a bent portion L, as indicated in dotted lines in Fig. 3 andin full lines, Fig. '7, to receive the winding-drum for the samepurpose.

It will be noticed that the winding-drum is mounted in a movable frame,and not rigidly attached to the levers of the scoops, as is nowpracticed, and that after the scoops have been closed onto the materialthe weight of the load is sustained by the drum.

The operation of our device is as follows: The scoops are open, asindicated in full lines in Figs. 1, 2, and 5, by the weight of thedevice which is being supported by the rope or chain I, and thewindingdrum rests upon the cross-bars of the scoops. In this openposition the scoops are let down onto the coal or other material to beexcavated. The lowering of the winding-drum causes the chains G tounwind, thus winding the chain F onto the grooved wheel F. Power is nowapplied to the chain F, which turns the drum, winding the chains G ontothe same, and in this act of winding the power exerted on the frame Gtends to force the scoops down into the material. After the chain F hasbeen unwound from the wheel F the power is still continued, and theweight of the device comes onto the drum. This causes the drum to rise,and through the links or levers D and levers B the scoops are closed,and the drums, with the levers, are carried up to the position shown indotted lines in Figs. 1, 2, and 5. After the scoops are closed thedevice is carried with its load to the place where it is to bedeposited, when the weight of the device, with its load, is transferredto the chain I. raises the frame G and opens the scoops. The descent ofthe drum unwinds the ropes G and winds the rope or chain F onto thewheel F.

What we claim, and desire to secure by Letters Patent, is

1. In an excavating device of the character described, the scoopsprovided with the leverarms crossed and pivoted together, as described,the upper ends of said levers being pivoted to one end of toggle-levers,the other end of said toggle-levers being pivoted to the frame whichsupports the chain-operating drum.

2. In an excavating device of the character described, thechain-operating drum mounted in suitable bearings in end bars, said barsbeing connected to the arms or levers at the scoops by toggle-levers,whereby the raising and lowering of the drum operates to open and closethe scoops, as set forth.

' 3. In an excavating device of the character described, thecombination, with the windingdrum, the winding-wheel located thereon,and the operating-chains, of the scoops, the crossed levers carrying thesame, the toggle-levers connecting with the crossed levers and with theedges of the scoops, the curved arms pivotally connected to the saidedges of the scoops, and the connecting-bar to which the upper ends ofsaid arms are pivotally connected, whereby the scoops may be lowered orelevated and opened or closed automatically, substantially as specified.

4. In an excavating device of the character described, the combination,with the crossed levers fulcrumed at their intersections and carryingthe scoops, of the toggle-levers connecting the said crossed levers withthe shaft of the winding-drum, the cross-bars connecting the ends of thescoops being curved to permit the drum to settle well down between thescoops, substantially as specified.

5. In an excavating device of thecharacter described, the combination,with the scoops and the system of operating levers and chains, of thecross-bars having a portion thereof bent, as described, to permit thewindingdrum to settle well between the scoops, substantially asspecified.

6. In an excavating device of the character described, the combinationof a winding-drum having spiral grooves 011 its periphery near each end,a winding-wheel mounted on said drum, the chains adapted to wind on andunwind from the drums and winding-wheel, respectively, and the scoops,crossed levers, and connecting toggle-levers, whereby the scoops areoperated, substantially as specified.

7. In an excavating device, the scoops A and A, provided with theleversB, pivoted together, in combination with the levers D, theconnecting-bars E, to which said bars D are hinged, the scoops at thelower ends of the levers B, the rods H H, connecting the This enter endscf the bars E to the top bar G,

In testimony whereof we affix our signatures the chains G G, connectedto the drumE,

in presence of two subscribing witnesses.

passed through the suspended pulleys H and THOMAS MCBRIDE. secured attheir lower ends to the ends of the EBENEZER FISHER. shaft of thewinding-drum, and the chain F, Witnesses:

connecting the winding-drum with the top WM. MCBRIDE,

bar G, substantially as specified. JOHN MCBRIDE.

